4g63tmirage
New member
- Joined
- Jul 10, 2011
- Messages
- 3
Customer has a 2001 24V, Installed a set of BD toing twins, At the same time did head gasket & studs. Had the head surfaced, new exhaust guides, valve job & seals, and Hamilton springs & pushrods done at the same time.
Customer took truck everything was great, Happy with the extra power/torque. Stopped by after about 2500 miles on the new set up, and said he was using oil, about 2 qt. Looked into it and found that the exhaust valve seals were trashed, intakes were fine. Put new intake & exhaust seals and sent him on his way. Stopped back after about a week, everything was great again.
3000 miles later, back again, using oil--again... Looked at he valve seals,and they were trashed, again. took #1 cylinder apart (rockes/springs off) measured the guide stick out and compared to a stock virgin head I had , and the height was with in .002 of old vs new guide. Asked the machine shop that did the work on he head if they sunk the valve back to factory specs after they surfaced the head. He said yes. Checked retainer to seal clearance next, Intake has about .020, Exhaust is none, Valve spring installed height is as per Hamilton specs, Cant see what changed to make retainer crash into the seals. Also top of valve seal is at the same height as the stock head,so they are on the guide the whole way..
Any ideas????
Customer took truck everything was great, Happy with the extra power/torque. Stopped by after about 2500 miles on the new set up, and said he was using oil, about 2 qt. Looked into it and found that the exhaust valve seals were trashed, intakes were fine. Put new intake & exhaust seals and sent him on his way. Stopped back after about a week, everything was great again.
3000 miles later, back again, using oil--again... Looked at he valve seals,and they were trashed, again. took #1 cylinder apart (rockes/springs off) measured the guide stick out and compared to a stock virgin head I had , and the height was with in .002 of old vs new guide. Asked the machine shop that did the work on he head if they sunk the valve back to factory specs after they surfaced the head. He said yes. Checked retainer to seal clearance next, Intake has about .020, Exhaust is none, Valve spring installed height is as per Hamilton specs, Cant see what changed to make retainer crash into the seals. Also top of valve seal is at the same height as the stock head,so they are on the guide the whole way..
Any ideas????
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